<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <script src="js辅助响应式.js" type="text/javascript"></script>
        <meta name="viewport" content="width=750, initial-scale=1.0">
        <style type="text/css">
            *{
                margin: 0;
                padding: 0;
            }
            .d1{
                width: 2rem;
                height: 2rem;
                background-color: skyblue;
                margin: 0 auto;
            }
            #icon{
                    width: 2rem;
                    height: 2rem;
                    background-size: 100% 100%;
                    margin: 0 auto;
                }
            .iphone #icon{
                background-image: url(../../../16/03_实践/5navigator/img/iphone.png);
            }
            .ipad #icon{
                background-image: url(../../../16/03_实践/5navigator/img/iPad.png);
            }
            .pc #icon{
                background-image: url(../../../16/03_实践/5navigator/img/pc.png);
            }
            .android #icon{
                background-image: url(../../../16/03_实践/5navigator/img/Android.png);
            }
        </style>
    </head>
    <body>
            <div class="d1"></div>
            <div id="icon"></div>
    </body>
</html>